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Fan with self closing blades

Inactive Publication Date: 2002-05-14
TWITTER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

It is an object of the present invention to limit the additional blowing capacity required to cool a box comprising electronic devices in case of fan failure.
It is a further object of the present invention to limit the air leakage generated by a failing fan.
The present invention relates to a system for cooling a box comprising electronic devices and more particularly to a fan with self closing blades for, in case of failure, preventing air leakage in a box comprising a plurality of fans.

Problems solved by technology

This implies complex sensors, powerful amplification for fan servo control, and backup fans for replacing the failing fan.
None of these documents approaches the problem of closing the a opening of a failing fan for reducing air leakage in a box or enclosure comprising a plurality of fans.

Method used

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Embodiment Construction

An object of the invention is to avoid the problem of air leakage generated by a failing or malfunctioning fan. When a fan fails, it not only stops producing an air flow, but it also generates an air leakage to the box. Consequently, additional blowing capacity is required from the fan system to compensate for this air leakage and to correctly cool electronic devices arranged within the box. This problem is illustrated in FIGS. 1 and 2.

FIG. 1 is a front view of a fan system according to the prior art for cooling a box or an enclosure comprising a plurality of electronic devices. FIG. 2 is a top view of a box or an enclosure comprising a plurality of electronic cards (6) and a plurality of fans (1,2,3) for cooling the electronic components mounted on said cards (6) according to prior art. The fan (2) in the middle of the cooling system is stopped. The two other fans on the left (1) and on the right (3) are operating (blowing).

One part of the remaining air flow (4) is oriented towards...

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PUM

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Abstract

A fan system to be mounted over an opening including a plurality of pivoting blades fixed on a free wheeling element and a motor driven element wherein, in operation, when the fan is operating the motor driven element pivots the blades to a blowing position allowing air flow through the opening, and when the fan is not operating a resilient member pivots the blades to a closed position preventing air flow through the opening.

Description

The present invention relates to a system for cooling a box comprising electronic devices and more particularly to a fan with self closing blades for, in case of failure, preventing air leakage in a box comprising a plurality of fans.In many electronic systems, the electronic cards are cooled by air. An air flow goes through the electronic cards, and thus cools down the electronic components situated on the cards. This allows power dissipation in such components and maintains the silicon temperature of such electronic components (in particular semiconductor chips) to a value compatible with specifications.The common implementation of a cooling system in a large computer or telecommunication system comprising a plurality of electronic devices is to arrange an array of fans (blowers, ventilators) controlled by a servo mechanism capable of detecting over temperature conditions, lack of fresh air, air renewal deficiency, defective air circulation, fan failures or malfunctions, and capab...

Claims

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Application Information

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IPC IPC(8): F04D29/36F04D29/32
CPCF04D29/364
Inventor JACOB, FRANCOIS
Owner TWITTER INC
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